.brandIntroduction_top {
    height: 1rem;
    width: 100%;
    max-width: 640px;
    background: #d0121b;
    position: fixed;
    top: 0;
    .Top_black {
        top: 50%;
        left: 5%;
        transform: translate(-50%, -50%);
        color: #fff;
    }
    .Top_input {
        width: 70%;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        input {
            width: 100%;
            height: .6rem;
            border: 1px solid #fff;
            border-radius: 5px;
            text-indent: .7rem;
            font-size: .26rem;
            background: #d0121b;
            color: #fff;
        }
        input::-webkit-input-placeholder {
            color: #fff;
        }
        i {
            left: 7%;
            top: 50%;
            transform: translate(-50%, -50%);
            font-size: .4rem;
            color: #fff;
        }
    }
    .Top_category {
        right: 0%;
        top: 50%;
        transform: translate(-50%, -50%);
        color: #fff;
    }
}
.brandIntroduction_top_after {
    height: 1rem;
}